Hardiness Zones

USDA Plant Hardiness Zones

What’s my zone—and when should I plant?

Enter your ZIP code to find your USDA hardiness zone and see recommended planting windows for your Simply Seedly kit.

ZIP code

We use your ZIP to match a zone. Always double-check microclimates (coast, canyons, elevation).

Zone – Planting Window

Your recommendations

Shop Scout Kit – 8" Shop Sage Kit – 12"

Zones 1–4: cold

Zones 5–7: moderate

Zones 8–10: warm

Zones describe your typical winter lows. They help predict what survives your coldest nights—not your summer heat. Planting windows below are generalized; specific crops vary.

How this works

We map your ZIP to a USDA zone using our internal dataset. Then we show seasonal guidance based on first/last frost patterns for each zone group.

General planting windows by zone

Zone	Cool‑season crops	Warm‑season crops
1–4	Late spring → midsummer	Short summer (after last frost)
5–7	Early spring & fall	Late spring → summer
8–9	Fall → early spring	Early spring → early summer
10	Late fall → winter	Winter → spring (avoid peak heat)

Tip: Coastal areas (like San Diego) behave milder than inland spots in the same ZIP. If you’re near the ocean or at higher elevation, slide your timing a few weeks earlier/later.

FAQ

What if my ZIP spans multiple zones?

Use the more conservative (colder) zone, then adjust by microclimate. Neighborhoods on hills, in canyons, or next to water can differ.

How do I use this with Simply Seedly kits?

Match your zone to the windows above. Our Scout (8") and Sage (12") kits include seeds chosen to succeed within those windows. Follow the included week‑by‑week instructions.

Can I plant outside the window?

Yes—with protection. Use your mini‑greenhouse dome to start early, provide shade cloth in heat waves, or add frost cloth for cold snaps.

For developers / store admins

Replace the ZIP→Zone dataset with your full CSV (zip,zone). Paste it into the <script id="zip-data"> block as CSV, or swap to JSON (see comment).

Shopify → Online Store → Pages → Add page → In the editor, switch to "Show HTML" & paste this whole file. Or add a "Custom liquid/HTML" section in your theme and paste between <section> tags.